i4^ TjXperiments and Ohfervatwiii 



the foiith, which was tranfparcnt, I found only one Cg'g^ 

 batched* In another fmall tranfparcnt bottle, which con-* 

 taincd fome thoufantls of cg-^rs, there were onlv five capabld 

 of being hatched, as all the relt had perilhcd. I removed a 

 bit of the black coating fif)m the jar, that I miglit be ablci' 

 to obfcTve the caterpillars; I left it expofed lo the 1"un along 

 with its companion, and I can allert, tliat after that period 

 liot oile of the eggs was hatched, if I except the firll and 

 iecond day, when a few came forth. 



The fpecdler. hatching of the eggs in the coated jar might 

 be afcribi^d to the greater degree of heat it experienced, if the 

 Air contained in the jar had not had free comniunication 

 with tlic external air. 



The jars expofed to tlic north, in fiich a manner as to re- 

 ceive only a l^etleclied light, muft inform us whether thi? 

 light wa;9 equally fenfible to the tender germs. On the 2ift 

 rtf April, indeed, I found fcveral of them already hatched in 

 the black jar, aiid three days after they began to become 

 animated in a paper cornet, in which I kept a great number 

 of them fliut up, and it was hot till the end of five days that 

 Ihey began to be hatched in the tranCparcnt jar expofed to 

 the north. 



I repeated thefe experirnents in 1798, with this difference, 

 that I varniilied my glaflTcs with oil colours, and that to the 

 black tranfparcnt ones I added others covered with red and 

 white paint. 



The refults were equally decifive_, fince at noon I faw' all 

 the eggs ^jontained in the black jai* hatched firl^, then a great 

 part of thofe in the white, but none of tliofe I left in the 

 tranfparcnt one; on the contrary, they foon aflumed a 

 pearly grav eolour, which T found by experience to. .be a 

 certain fign that the eggs \vere no longer fufceptible of being 

 hatched. 



The remaining ea'gs contained in the red jar and the white 

 one towards the fouth became alfo gray, and incapable of 

 beinsr hatched. The experiment was attended with the 

 fame fuccefs towards the north, fince the firlt hatched were 

 ihofc in the black jar^ then thofe in the red and white ones 



aluu'.ll 



