24 FORESTRY [Box. Absts., Vol. VIII, 



oak in Kangra) have shown that Acacia modesta in Jhelum and Rawalpindi can be coppiced 

 at any season of the year without trimming the stumps. In Lahore it is found that 

 shisham seed collected from coppice is as good for cultural purposes as that from seedling 

 trees. While difficult, an attempt will be made to control the shisham fungus by the use of 

 watering trenches instead of flooding the whole area. Yield tables have been completed in 

 Kulu during the year for deodar, blue pine, Chil, and fir. From ten years' observations and 

 experiments it is concluded that the shelter-wood compartment system is the best method 

 of insuring the regeneration of the coniferous forests of Kulu, and this system is therefore 

 being adopted in the new working plan for the locality. European larch is doing well experi- 

 mentally in Kulu. Various species of Eucalyptus in the Simla hills in experimental plantings 

 still give no encouragement. The time seems at hand for appointing a Utilization Conser- 

 vator (as in the United Provinces) for the Punjab to be the business head of the Department 

 and control all its timber works, the sale of timber, the resin industry, and be in charge of the 

 development of new markets and industries. The Government of India is considering co- 

 operation of the Punjab with the North-West Frontier Province and Baluchistan with this 

 idea in view, and also a plan of administrative reorganization. — E. R. Hodson. 



182. Palmer, Andrew H. Economic results of deficient precipitation in California. 

 Monthly Weather Rev. 48:586-589. 1920. — Because of markedly deficient precipitation in 

 northern and central California during the past 4 rainy seasons serious loss resulted during 

 the dry season of 1920. Streams reached the lowest stages on record. The Sacramento 

 River at Sacramento fell below mean sea level, and the current of the stream was reversed. 

 The saline waters of San Francisco Bay encroached upon rich agricultural lands of the delta 

 region, reducing the vegetable crops, driving the dairy industry to other regions, and threat- 

 ening irreparable damage to alluvial soils through the infiltration of salt water. The 

 teredo, or "ship worm," a minute salt-water organism, did great damage to wooden struc- 

 tures. The average yield per acre of many crops was reduced in 1920 because of defi- 

 cient moisture. Rice growers felt the drought keenly, because of the large water require- 

 ments of rice. Hydroelectric power shortage resulted in power restrictions and higher 

 rates. Wells went dry because of the lowered level of ground water. Forest fires were more 

 frequent and destructive than in past years, owing to the parched condition of the forests. — 

 Author's abstract. 



183. Pearson, R. S. The utilization of bamboo for the manufacture of paper pulp. Indian 

 Forester 46: 547-561, 603-631. 2 pi. 1920.— The supply of pulp woods is getting 

 lower throughout the world and the price and demand are rising. Paper companies are 

 now turning to plants other than trees and the bamboo has been found to be suitable for 

 ground and sulphite pulp. Data are given on the probable yields, costs of extraction, loca- 

 tion of mills, etc., for the various localities in India where pulp material exists in sufficient 

 quantity to warrant the establishment of pulp mills. — E. N. Munns. 



184. Pemberton, C. C. Living stumps of trees. Amer. Forestry 26: 614^616. 6 fig. 

 1920. — There are instances of stumps of cut trees which do not die, and which retain their 

 vitality to a surprising extent and apparently without the aid of foliage. It is concluded 

 that the union or indirect grafting of roots of the cut stump with those of living trees 

 standing adjacent accounts for the phenomenon. — Chas. H. Otis. 



185. Perrot, Em. Notes biologiques sur las Acacias fournisseurs de gomme, dite ara- 

 bique, au Soudan egyptien. [Biological notes on the Acacias producing gum arable in Egyptian 

 Sudan.] Compt, Rend. Acad. Sci. Paris 171: 258-268. 1920.— The method of making the 

 incision is described as is also the process of healing. The season for flowing is from May to 

 October. — C. H. Farr. 



186. Petrie, W. B. Effect of cultivation on tree growth. Australian Forest. Jour. 3: 231. 

 1920. — A note on the increased growth of Agathis robusta and Grevillea robusta due to cultiva- 

 tion. — C. F. Korstian. 



