M. Brock 1957 Raising 2 youngs litter 2 July 13 A.R.L. Barrow, northern Alaska to the other end of the aquarium and acts severous. These disturbances may have caused the loss of three in the first litter. July 16 All six still alive - naked (hairless), eyes closed. Only two weighed for fear of disturbing female too much. One weighed 3.9 grams the other 4.5 grams July 18 All six still alive, fully haired, a very brownish colored hair with a median dorsal dark line running over the head and only half length of the body. Two youngs were weighed one 5.0 grams the other 5.4 grams July 21 All six alive - two weighed, one 6.4 gr the other 6.7 grams. All are fully haired toes no longer fused and eyes still closed. The hair for some reason or another on these eight day old lemmings is quite brown with a short dorso-median dark line while the study skin of the 16 day old from litter one is quite grey. July 23 Two youngs weighed, one 6.5g the other 5.2g, both have eyes closed, are very brown July 25 Two youngs weighed about 6.0 g each They are very active now and their eyes are just opening. All are up and