156 THE AMERICAN BOTANIST 



Brumbaugh of Pennsylvania set aside Friday, October 18th, as 

 Walnut Tree Planting Day. On that day all residents of Penn- 

 sylvania were urged to plant walnuts. This example is worth 

 following by other commonwealths, but citizens of other States 

 need not wait for executive action to begin the work. Owing to 

 the long taproot and few lateral roots, young trees are difficult 

 to transplant though this can be accomplished. The best way, 

 however, is to get the nuts, still in their yellow-green hulls and 

 plant them where trees are desired. The boy scouts ought to 

 take this scheme up with great enthusiasm ; walnut planting is 

 likely to benefit them rather more than other members of the 

 o immunity. The nuts should be planted about four inches deep. 

 During the past few years, the walnuts in some parts of the 

 Middle West, and perhaps elsewhere, have been entirely de- 

 foliated by a hairy caterpillar somewhat larger than the tussock 

 moth. The trees do not recover from such attacks as some 

 other species do and, if the supply of walnut is to be guaranteed 

 in the future, the trees will have to be protected as well as 

 planted, and this right promptly. 



BOOKS AND WRITERS 



There are many ways of multiplying desirable plants that 

 only the practical plant grower knows anything about. The 

 experienced gardener, confronted with an unfamiliar plant, 

 knows almost instinctively the best way to propagate it. Those 

 who lack this kowledge will he well on the way to acquiring it 

 after reading "Commercial Plant Propagation" by Alfred C. 

 Hottes, assistant Professor of Horticulture at Ohio State Uni- 

 versity. The whole subject is covered in a very exhaustive 

 manner, whether seeds, buds, bulbs, grafts or other cuttings 

 are discussed. In many cases a number of ways of doing a 

 thing are described, enabling the plant propagator to choose his 



