342 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
experiment by means of water from a pipette and by fanning. Both 
Desmognathus and Diemyctylus, under conditions as nearly as possi¬ 
ble alike, were left for a half hour in this position. 
When first removed from the tube, the lungless form, Desmogna¬ 
thus, was much more lively than Diemyctylus. It moved around in 
an active manner on the table, and swam when put into water, turning 
over with quick motions. The lunged form, Diemyctylus, made no 
voluntary movements on the table nor in water. Both forms re¬ 
sponded to mechanical stimuli and to the stimulus of drops of acetic 
acid applied to various parts of the body. They were placed in the 
terrarium, from which they had been taken, in order to secure a return 
to conditions as normal as possible. Desmognathus did not cease to 
cotton soaked in water; g.t., glass tube; h., hole in glass tube for thread; s., 
rubber stopper; t., tack. 
respond to stimuli for almost forty-three hours, after which it died. 
Diemyctylus responded to stimuli for a much shorter time, about 
twenty-six hours, before all signs of life failed. 
The second set of tests on the living animal was made to bring about 
conditions opposite to those just described. The supply of air to the 
mouth was free and the influence of chloroform was brought to bear on 
as much of the surface of the skin as possible. Here again Desmog¬ 
nathus fusca and Diemyctylus viridescens were used for experimenta¬ 
tion. The apparatus is shown in fig. D. A rubber stopper (p. s.) was 
perforated with a hole large enough to receive the salamander s head 
and fore limbs. The head protruded from the outer end of the 
stopper, and the fore limbs were fastened there by means of thread 
