During this precarious period of development the mother should continue to influence the growth of the child's conscience.

During the period from 1 July 1960 through 31 January 1961, additional research affiliations were effected with the U. S. Army Medical Research and Development Command to conduct research in procedures for quantitative electron microscopy, and for the study of biophysical and biological studies of the structure and function of ocular tissue.

During this period, a total of 762 exhibits were presented at 442 medical and scientific meetings.

During the period of this report, 37,470 new cases were entered into the various registries.

During this period, 7,827 teaching sets were distributed on loan.

During the period of this report, 63 panel exhibits depicting the latest developments in medical research were displayed.

During the period, the laboratory rendered centralized macropathological service to qualified requesters.

During the period from 1 July 1960 through 31 January 1961, the Medical Museum was required to move to Temporary Building `` S '' on the Mall from Chase Hall.

During the period of about 4 hours around sunset, skywave transmission conditions are building up until full nighttime conditions prevail ; ;

During the Civil War period Mr. Brown also invented the Brown & Sharpe formed tooth gear cutter, a basic invention which ultimately revolutionized the world's gear manufacturing industry by changing its basic economics.

During this period 7,484,268 members were received, yet the net membership now is only 9,910,741.

During the period of the Iberian Union ( 1580 – 1640 ), Portugal lost influence and power and made new enemies.

During the Romantic period, art came to be seen as " a special faculty of the human mind to be classified with religion and science ".< ref >

During the same period the Georgian states of Colchis and Tabal arose around the Black Sea and central Anatolia respectively.

During this same period, slave-holding border states had more free African-Americans and European immigrants than the lower South, which increased Southern fears that slavery was threatened with rapid extinction in this area.

During this period he published 18 plays and 3 novels, including the murder mystery The Red House Mystery ( 1922 ).

During this period winter sports were slowly introduced: in 1882 the first figure skating championship was held in St. Moritz, and downhill skiing became a trendy sport with English visitors early in the 20th century, as the first ski-lift was installed in 1908 above Grindelwald.

During the post-World War I period ski-lifts were built in Swiss and Austrian towns to accommodate winter visitors, but summer tourism continued to be important ; by the mid-20th century the popularity of downhill skiing increased greatly as it became more accessible and in the 1970s several new villages were built in France devoted almost exclusively to skiing, such a Les Menuires.

During the first 11 months of 2006, net imports grew by 21 percent to $ 1. 95 billion, while exports stood at $ 895 million, up 0. 3 percent from the same period in 2005.

During the first 11 months of 2006, the European Union remained Armenia's largest trading partner, accounting for 34. 4 percent of its $ 2. 85 billion commercial exchange during the 11-month period.

During January – February 2007, Armenia ’ s trade with Russia and other former Soviet republics was $ 205. 6 million ( double the amount from the same period the previous year ), making them the country ’ s number one trading partner.

During this period, spectator attendances dropped and media condemnation increased, but Simpson and Lawry flatly disregarded the public dissatisfaction.

During the Tokugawa period ( 1600 – 1868 ) the Ainu became increasingly involved in trade with Japanese who controlled the southern portion of the island that is now called Hokkaido.

During this period Agamemnon and his brother, Menelaus, took refuge with Tyndareus, King of Sparta.

During the Akkadian period, the Akkadian language became the lingua franca of the Middle East, and was officially used for administration, although the Sumerian language remained as a spoken and literary language.

During flight under IFR, there are no visibility requirements, so flying through clouds ( or other conditions where there is zero visibility outside the aircraft ) is legal and safe.

During the colder months, December to February, visibility at higher elevations is often restricted by fog.

During the war, Rathbone displayed a penchant for disguise ( a skill which he coincidentally shared with what would become perhaps his most memorable character, Sherlock Holmes ), when on one occasion, in order to have better visibility, Rathbone convinced his superiors to allow him to scout enemy positions during daylight hours instead of during the night, as was the usual practice in order to minimize the chance of detection by the enemy.

During a snowstorm that caused reduced visibility, two married couples died when they drove their respective cars into the frozen lake on New Year's Day, 1957.

During World War II, night fighters were either purpose-built or " day " fighters modified to be effective night fighting combat aircraft, often employing radar or other systems for providing some sort of detection capability in low visibility.

During the late 1990s, the increased popularity and visibility of " superstar DJs " led to the creation of superclubs such as Liverpool's Cream and Sheffield's Gatecrasher.

During the First World War, an attempt to reduce the visibility of military aircraft through the experimental use of " Cellon " plastic transparent covering material resulted in single examples of the Fokker E. III Eindecker fighter monoplane, the Albatros C. I two-seat observation biplane, and one German heavy bomber design, the Linke-Hofmann R. I all being covered with the " Cellon " material ; the latter two aircraft had all-wooden structures covered with the " Cellon " material, which degraded rapidly in direct sunlight and were not proceeded with any further.

During periods of severe precipitation, the city's commuter rail system is often suspended because of water logging and poor visibility.

During this period, the arrival of various bands including the influential Thabawa Yinthwenge ( The Wild Ones ), which included lead singer Sai Htee Saing, an ethnic Shan in 1973, paved the way for ethnic minority musicians to gain visibility in the Burmese music industry.

During times of reduced ceilings and visibility ( 800 ft / 2 miles ) or during ILS Autoland ( coupled ) approaches pilots are expected to:

During the 20th century, the growth of traffic using the road, with resulting accidents and congestion on what was a humpback bridge with poor visibility and narrow approach roads, led to many proposals to by-pass the bridge.

During the following five and a half days of nearly continuous eruption, residents of Nikolski ( 47 miles southwest ) were stranded for periods of up to three weeks ; Unalaska ( 73 miles northeast ) was repeatedly dusted with ash and flights into and out of this major fishing hub were frequently disrupted ; floating rafts of scoria and high visibility prompted the Coast Guard to close Umnak Pass to marine traffic ; and the Bering Pacific cattle ranch on the flanks of Okmok was periodically evacuated, once during noon-time darkness caused by heavy ash fall.

During its short period of naked eye visibility it was widely observed throughout the southern hemisphere.

During the immediate post-war period, BEA suffered a number of accidents during approach and landing in poor visibility, which caused it to focus on the problems of how pilots could land safely in such conditions.

During the 1970s and prior it was not uncommon for a stationary drum major to do a high-lift mark time on the podium for an audible and visual tempo ; with the arrival of increasingly higher drum major platforms and thus greater visibility this has become both dangerous and unnecessary.

During winter, the northern stretches of the highway that pass through the snowbelt region of Grey County are subject to poor visibility and road closings during windy conditions or winter storms.

During the afternoon of January 7, the airport recorded the necessary three consecutive hours of frequent wind gusts to at least combined with a prevailing visibility consistently below along with falling and blowing snow, meeting the official NWS standard of a blizzard.

During the approach to Bangkok the weather conditions deteriorated significantly, from 8 km visibility half an hour before landing to 750 m at the time of landing.