400 NATURAL SCIENCE. Nov., 1894, 



search for fruits, and have eaten the dead body. Judging from our present 

 animals, the change from a vegetable to an animal diet must have been very easy. 

 Most of our frugivora, as squirrels, etc., will eat insects, and not unfrequently 

 prefer them. 



I have supposed the change to have taken place in the Glacial Period, but 

 obviously this is not essential. The essential points are, (i) fierce struggle for 

 existence, (2) liability to sudden attack, (3) recourse to trees cut off. 



Most probably this hypothesis will prove untenable on criticism, but I think I 

 have shown that the erect posture is not an insuperable stumbling-block, that at 

 least it is possible to imagine ways in which it might have come about. 



6 Harrington Street, Dublin. J. R. Holt. 



TO CORRESPONDENTS. 



All communications for the Editor to be addressed to the Editorial 

 Offices, 5 John Street, Bedford Row, London, W.C. 



All communications for the Publishers to be addressed to Macmillan 

 and Co., 29 Bedford Street, Strand, London, W.C. 



All Advertisements to be forwarded to the sole agents, John 

 Haddon & Co., Bouverie House, Salisbury Square, Fleet Street, London, E.C. 



CHANGE OF ADDRESS. 



On and after December 2j\.th, 1894, ^^^^ Publishing and Editorial 

 Business of "Natural Science" will be carried on at the Offices of 

 Messrs. Rait, Henderson & Co., Ltd., 22 St. Andrew Street, 

 Holborn Circus, London, E.C. 



To Contributors. — All communications to be addressed to the Editor 

 of " Natural Science " at the above address. 



To Subscribers. — " Natural Science " will be delivered Post 

 Free to any address in the Postal Union, for an Annual Subscription of 

 Fourteen Shillings, or its equivalent in foreign money, payable in advance 

 to Messrs. Rait, Henderson & Co., Ltd., at the above address. 



Volume VL will begin with the January number ; but Subscriptions, 

 as above, may begin at any time. Those who may have already renewed their 

 subscriptions with Messrs. Macmillan will receive their copies as heretofore. 



Single Numbers, at a price of One Shilling Nett, may he 

 ■ordered of any Bookseller ; or will be delivered Post Free by Messrs. 

 Rait, Henderson & Co., Ltd., on receipt of One Shilling and Two- 

 pence. 



To THE Trade. — " Natural Science " will be ready for delivery to 

 the Trade on the i^th of every month. Copies will be obtainable, by Sale or 

 Exchange, and at the same rates as heretofore, from Messrs. Rait, 

 Henderson & Co., Ltd., 22 St. Andrew Street, Holborn Circus, 

 London, E.C. 



