64 Gen . Sub. 
I. GENERAL SUBJECTS. 
but causes no abnormality. Exposure to 0° (14 days) produces no ill 
effects on to stage of completed gastrulation ; but embryos with closed 
medullary tube were killed ; Sciiultze (496). 
Relative susceptibility of fish embryo to scarcity of oxygen and 
water. Embryo of Fundulus becomes more sensitive to lack of oxygen 
as it grows older ; the germ is more sensitive to lack of water during 
cleavage than after the formation of the blastoderm ; Loeb (311). 
By lowering the temperature, the period of time for the egg-laying 
and ejection of the spermatozoa may be changed ; Bunting (73). 
Influence of cold on development ; Braem (62). 
Temperature experiments on Lepidoptera : Effects vary at different 
periods. Great constitutional differences in sensitiveness. Difference of 
temperature may cause reversion ; Merrifield (345). — Discussion of the 
above ; Dixey (125). 
Thermotaxis of Euglena : In tubes placed in the dark there was 
movement of the Infusorians through sand or through water to warmer 
parts. When tubes were placed at right angles to rays of light, the 
animals avoided the heat ; if the tubes were placed in the same direction 
as the rays of light, they sought the end nearest the light, even in spite 
of heat. Relations of thermotaxis and heliotaxis require working out ; 
WlLDEMAN (576). 
Reactions to heat ; Riciiet (449). 
Responses to changes of temperature ; Pembrey (411), Pembrey & 
Gordon (411a). 
Effects of change of pressure ; Philippon (417). 
Influence of quality of food on form ; Cunningham (107). 
Coloured light affecting nitrogenous metabolism; Tarciianoff (529). 
Rarefied air on development of chick ; Giacomini (185, 186). 
Seasonal dimorphism of Japanese butterflies : Related to the fact 
that the extremes of the Japanese islands include arctic and tropical 
conditions ; Fritze (173). 
Seasonal change of colour in Lepus americanus : The change both in 
autumn and in spring is a change of fur, not a change of colour in the 
hair itself. The change is regularly periodic, may be somewhat accele- 
rated or retarded, but occupies many weeks. The progress of the change, 
as regards the parts first affected, is the reverse in spring of the order in 
autumn. During early spring, after the white overhair is shed, the 
pelage is the soft winter underfur, which is gradually replaced by the 
summer coat. In spring the moult occurs quite as early, and proceeds 
just as rapidly (if not a little more so) in the females as in the males ; 
Allen (4). 
Characters of cave animals : Argument in favour of transmission of 
acquired characters ; Packard (403). 
Subterranean Crustacean fauna ; Ciiilton (91). 
Animals thrown up from artesian wells ; Roll and (456). 
Experimental nanism : Nanism in limited space due to want of activity 
and movement ; Yarigny (543). 
