ADVERTISEMENT. 



With the issue of the first vohime of " American Spiders anrl their Spiimingwoi-k," the 

 author (who is necessarily tlie jjublisher also) announces the withdrawal of the special terms 

 offered to subscribers in the prospectus of Aujrust 1st, 1SS9. 



The price will be $30 for the set of three volumes. Payment is expected for each volume, 

 $10, as it is delivered. No volume will be sold separately. 



The several volumes will be mailed at the publisher's expense, bound in stout cloth suitable 

 for ordinary library use, but with uncut edges for the accommodation of those who wish 

 special library binding. 



"The Author's Edition" is strictly limited to Iwn hundred nnd fiflij copies', which will be 

 numl)ered consecutively in the order of subscriptions, as received. 



The firet two volumes are devoted to a descri])tion of the Industry and Habits of Orli- 

 weaving spiders, both separately and in their relations to the spinning economy of other 

 aranead tribes. The First Volume treats particularly of Snares and Xests. The Second 

 ^■olume will treat of the Cocooning Industry, Maternal Instincts, and (ieneral Habits. These 

 volumes are lilierally illustrated !)}• drawings from Nature, the Firet \'olume alone containing 

 three hundred and fifty-four figures. The Third Volume will be devoted to descrijitions of 

 the Orbweaving fauna of the United States, accompanied by a large number of lithographic 

 plates, painted by hand in the colore of Nature. 



All Inisiness comnuniications and subscriptions may be addressed directly to tlie autlior or to 



"American Spiders .\nd their Spinxixgwork," 



Academy op Natural Sciences, 



Logan Square, Philadelphia. 



The author's published works upon the ants may be had on the following terms : — 

 "The Natural History of Ihe Agricultural Ant of Texas." Octavo, bound in cl(.)th, 



pp. 312, plates XXI\' So 00 



" The Honey Ants of the Garden of the Gods, and the Occident Ants of the Amer- 

 ican Plains." Octavo, bound in cloth, pp. 188, plates XIII 1 50 



" The Jlound IMaking Ants of the AUeghenies. Paper, pp. .56, plates VI 7.5 



These will 1)C mailed to any ad<lress for the above prices, or the three works for . '^ 00 



Address, " Academy of N.vtural Sciences," 



Logan Squabe, Philadelpuia. 



