250 EXPERIMENT STATION RECORD. [Vol.35 



Batangas. The mandarin (C nobilis) appears to be extremely sensitive, the 

 calamondin (C. mitis) being less severely injured, and the svpeet orange {C. 

 aurantium) and the pomelo (C. decumana) being seldom affected to a serious 

 degree. 



The disease and its results are described. It is supposed to be produced by 

 unfavorable soil and culture conditions, one of the main factors being the 

 packing of the soil, which prevents aeration and drainage. Irregularity of 

 water supply appears to be another factor. Recommendations include proper 

 plowing, varying in depth each year, planting in the rainy season to cover crops, 

 which should be cut and left as a mulch during the dry season, removal of 

 diseased spots, and covering the wounds with lead paint. 



Some abnormalities of the coconut palm, T. Fetch {Ann. Roy. Bot. Gard. 

 Peradeniya, 6 {1915}, No. 1, pp. 21-30). — The author gives an account of abnor- 

 malities which he has noted during the last few years, including yellow coco- 

 nuts, double coconuts, prolification, and hypertrophy of the perianth. 



The effect of lightning' on coconut palms, T. Fetch {Ann. Roy. Bot. Gard. 

 Peradeniya, 6 {1915), No. 1, pp. 31-42). — The author gives collected accounts and 

 his own observations of injuries to coconut palms by lightning in tropical and 

 subtropical regions. The visible effects discussed are combustion of the crown, 

 mechanical injury, and exudation of the gum, often with little or no indication 

 of mechanical injury. The last is thought to be sometimes connected in some 

 way with the heat generated by the electrical discharge. 



Black canker of chestnut, L. Fetei {Alpe [Italy], 2. ser., 2 {1915), Nos. S, 

 pp. 94-99, pi. 1; 5, pp. 188-196, figs. 3). — Discussing the findings and views of 

 others regarding the factors which produce or favor black canker of chestnut, 

 the author describes the phenomena observable in the origin and development 

 of the abnormal conditions associated with the presence of several fungi. He 

 distinguishes between the rapid and quickly fatal attack usual to Coryneum 

 and the progress and behavior of the other fungi which commonly precede it as 

 regards the original attack and in some cases possibly furnish the conditions 

 for its rapidly destructive phase. It is stated that frost injuries apparently 

 favor Coryneum attack, which, in this case, may be of limited extent. 



From a study of the questions whether black rot of the roots precedes or 

 follows the infection of the branch&s and stem and whether Coryneum is able 

 to attack directly the roots and base of the trunk, the author has concluded 

 that, in case of plants just beginning to show disease, the base of the trunk and 

 contiguous portions of the larger roots may be found to show the alterations 

 associated with black rot before Coryneum can be demonstrated in the upper 

 portions. The infection of the base of the stem by Coryneum may be noted in 

 nursery stock or in chestnuts used as replants where older plants have died with 

 black rot. The initially basal attack by Coryneum appears to be limited by 

 the age of the plant. It is said that it may be difficult in an advanced stage 

 of the disease to establish the order of precedence of the two infections, that of 

 Coryneum proceeding from above downward and that of other fungi proceeding 

 upward. 



The influence of the tannin content of the host plant on Endothia para- 

 sitica and related species, M. T. Cook and G. W. Wilson {Bot. Gaz., 60 {1915), 

 No. 5, pp. 346-361). — This is a more extended report on investigations the main 

 results of which have been noted from another source (E. S. R., 32, p. 646). 



The influence of ether on the growth of Endothia, M. T. Cook and G. W. 

 Wilson {Bot. Gaz., 60 {1915), No. 5, pp. 412, 413).— The: authors, giving re.sults 

 of some studies in connection with those noted above, state that while small 

 quantities of ether in liquid culture media appear to have a stimulating effect 



