46 EXPERIMENT STATION EECOKD. [Vol.41 



and younger vines on a one-tenth acre plat amounted to 36.44 lbs. and sold for 

 $109.31. 



It is pointed out that vanilla growing should not be undertaken by anyone 

 who is unwilling or unable to give the requisite attention to the crop, since the 

 various operations require a considerable expenditure of time, care, and money. 



The industry is specially recommended for such districts as are accessible only 

 by poor roads over which bulky and more perishable products can not be carried. 



Planting the rural school grounds, C. P. Halligan {Michigan Sta. Circ. 36 

 (1919), pp. 4, fig. 1). — Concise suggestions are given relative to the use of native 

 plants, preparation of planting plans, where to plant, and rules for planting. 

 A list is given of native plants that may be available in neighboring fields for 

 improving the rural school grounds. 



FOEESTRY. 



Trees of Indiana, C. C. Dkam (Indianapolis: Ind. State Bd. Forestry, 1918, 

 2. ed., pp. 299, figs. 126). — This is a reprint of a part of the 1911 Report of the 

 State Board of Forestry, to which has been added a few notes and corrections. 

 All the woody plants of the State that usually attain a diameter of 10 to 15 cm. 

 (4-6 in.) have been included, and also a few that rarely attain this size in 

 Indiana. Each tree is considered under the heads of botanical description, dis- 

 tribution, economic uses, and horticultural value. 



Geologic history of the locust and its allies, E. W. Berby {Plant World, 

 21 {1918), No. 11, pp. 284-298, figs. 2). — This paper discusses the geologic his- 

 tory of the black locust (Robinia), the honey locust (Gleditsia), the Kentucky 

 coffee tree (Gymnoeladus), and the Judas-tree (Cex'cis). 



[Progress report on forestry investigations] {Kansas Sta. Rpt. 1918, p. 

 36). — The station is emphasizing the desirability of increasing the planting of 

 red cedar and black walnut, these species having shown under Kansas condi- 

 tions their superiority as windbreaks, ornamentals, and shade trees. Recent 

 investigations also show the bull pine to be a valuable ornamental tree which 

 has heretofore received too little attention in the State. 



Waipoua Kauri Forest, its demarcation and management, D. E. Hutchins 

 {Welli7igton, Neio Zealand: Dept. Lands and Survey, 1918, pp. 68, pis. 6). — This 

 comprises the results of a survey of the Waipoua Kauri Forest reserve in New 

 Zealand, with special reference to the demarcation and management of kauri 

 forests. 



Observations on distribution of forest tree pollen, H. Hesselman {Mcddcl. 

 Stat. Skogsforsoksanst., No. 16 {1919), pt. 2-3, pp. 27-60, figs. S).— A review of 

 the literature on this subject, including some data on observations made by 

 the author relative to the distribution of pollen from spruce, pine, and birch 

 trees. 



Pollen was collected on prepared surfaces on two lightships, one 30 km. 

 (18.6 miles) from land and the other 55 km. from land. Spruce pollen 

 grains were collected at the rate of 6,961, birch 6,811, and pine 2,390 grains 

 per square millimeter on the ship nearest shore ; and at the rate of 4,089, 

 3,649, and 1,069 grains per square millimeter, respectively, for spruce, birch, 

 and pine on the ship farthest from shore. Instances of even farther distri- 

 bution of forest tree pollen are cited and discussed, with special reference 

 to its influence on the question of sources of tree seed. It is pointed out that 

 the fertilization of flowers with pollen from long distance may work against 

 loc^l, climatic conditions. The author is of the opinion that the presence of 

 fossil pollen grains of certain trees in peat moors is not necessarily an index 



