320 THE CANADIAN NATURALIST. [Vol. X. 



to stop and consider our present position, and^ask what must be 

 done for the salvation of our trees — is there aoy means to replace 

 the millions of tree that are cut down annually? I reply in the 

 affirmative ; every one has the power and capacity to aid in 

 this great work. Does not every tree bear it own seed ? And sow- 

 iuii' or plantino; trees is no harder than sowins; orain. 



I have made a calculation that 200 acres (lots such as the pre- 

 sent divisions of our townships) planted with a double row of 

 trees, say maple, will give a belt of trees nearly three miles 

 long and a plantation of sugar or other trees. Experience has 

 shown that from 100 feet square of well prepared land sown with 

 ash there can be transplanted enough to cover 100 acres. A 

 return can be obtained after three years, as the smaller trees 

 removed in thinning can be utilized for hop poles, etc. If the 

 soil is well prepared a farm planted with trees will begin to give 

 a return after three years at the rate of $10 per acre, increasing 

 year by 3'ear to S40. 



MISCELLANEOUS. 



Worms and Crustacea^ is the title of Vol. vii. of the 

 "Guides for Science Teaching,'' issued by the Boston Society of 

 Natural History. This excellent little work of 68 pages is 

 specially intended for the use of teachers, but will also be found 

 of great service to those who desire in private to obtain a general 

 knowledge of the structure of the groups of animals of which it 

 treats. The first sixteen pages are devoted to a description of the 

 common earth-worm, and the Nereis or sea-centipede, which are 

 taken as typos of the classes to which they belong. The remain- 

 ing portion of the book contains a very accurate description of the 

 lobster, a crustacean easily obtained for study, and notes points 

 in which other groups of crustaceans differ from that taken as the 

 type. The book contains a large number of very good draw- 

 ings, greatly enhancing its value. We can scarcely see how the 

 publishers can give so much for so small a sum, the price of the 

 book being only thirty cents. 



*<• Worms and Crustacea,'' by Alpheus Hyatt, Boston Society of 

 Natural History. (Ginn, Heath & Co., Boston). 



Published, 22nd Sept., 1882. 



