l:lI-<",Y nl- IMF. SHAWNEE CAVE SPIDERS. $1* 



either in the IK; In or dark more than fifty per cent. 

 of the time, the per cent. depending mi the amount of degen- 

 eration. 



HUMIDITY. 



Apparatus. < ".la-s tube- with one-half-inch l>ore ami twelve 

 iii( lie- lon.y were u-e 1. The opening and three inches of one 

 end w I with Mack carlioii paper. The other end \\as 



< lo-ed \\itli .1 <-otion cloth. A -pider and two drop- of water 

 wen pla< <-d in the Ikht end of ea< h tnl.e ami the tube- were placed 

 in th<- li.yht the -aim- as in the liijn experiment-. When lirM 

 pla< ed in the lube- the -|>ecimen- wandered from one end to 

 the oil), r. In iu.-t a h w moment- th -ed their wandering 



and rein. lined within reach of the drop- of water. A- it \\.i- 

 ini|>o--iM- to \\.it< h i xjKTiments .ill the time, (|tiite fre- 



quently tin drop- ot \\.itir c\ .iporati d 1-efore m-u ones could 

 :ddid. ^oiiu-tiim-- when the ttil-e- liti.nne dr\ . the -pidcrs 

 were tound in th< d.irk end, other linn - in the li-ht end. 1 nder 

 MU h loiidition- -opie un- ,iM- to li\e only one or t \\ o d.i\-, 

 BOme tour or ti\e da\- while other- -ur\i\ed ten days. < Mil of 

 two do/en indi\ idn.il- n-<-i| not one .it .ui\ time w.i~ ever found 

 in the dark end when the li^ht end w.i- wet. Mach -|>ei imeii w.i- 



evimined. had eyes and others were devoid of < Jud^- 



llom the |.leied : inilit- oil lii^llt the -peiimeiis 



i|e\oid ot ' Mould ha\- foiiml in the dark end at time-, 



pi"\idiiK there wa- no other tatior -u'ii^er than ne-ati\e 

 photOtTOpism. Nm < t he-e -pi i iim -i- remained n.-ar the drop- of 

 water all the time in-tead - into the dark, \\ e i ncludc 



that hiimidilx i- a -ti tor than nei;ati\e plmtoi ropi-in. 



The -ami- e\]u rinieiit- were iii<l with the -piderlii 



and medium -i/i d -]K inn n- ot .\ !,:>:. At time- the-e were found 

 in the dark end when the li.uht end \\a- wet, tliereli^re pn>l>aMy 

 humidit\- with them i- not greater than ne;4ati\e photot ropi-m. 



( 'll ANi.l "I Hi MII'I l\. 







Afiparatns. The -aim- tul>c- a- u-ed in the |irecediii^ e\[ieri- 

 inent- for humidity, al-o a lu^rometer wa- eni]loy-d. A -pei i- 

 men wa- |>laced in i-ach lul'e and wa- <.l-er\ed -e\cral linn- 

 each day. The follow in- re-ult- -how the relatixe humidity and 

 the number of hour- and minutes various individuals lived. 



