208 



TKNANTS OF AN OLD FARM. 



FIG. 70. — WATER SPIDERS AND THEIR EGG-SAC CAISSON. 



flat, empty sac, with the mouth dowinvard, and as the 

 spider is an air-hreathing animal, is, of course, useless 

 as a domicile in that condition." 



The gentleman followed ni}' sketch with as much 

 interest as you all show in this craj'on outline. (Fig.70.) 



"Now, look here !" said my friend. "You're not 



