a Nee ee ee 
1918.] The Fifth Indian Science Congress. CXV 
he structural earn of importance in specific cases are detailed, 
and examples give iad on modification by external conditions such as 
light, humidity Vv, “anya 
C) ghee charactor which influence immunity are more 
difficult to define undoubt ow. the most important class of 
factors in the ma laeey ee eases. They a ii seine ith the nature of 
; 1t 
v 
dissolved in the " sap—is more important. Amongst these substances, 
tannin and organ st are shown to occupy a prominent place. _ 
islatvs. Fesosancs to specific diseases of different varieties of 
plants is discussed, vce indications given of the physiological characters 
most pretty conce 
external con nti tions which my. Lg aac resistance are 
chiefly Plimatic and nutritional. ag stan e locality does not 
= aad imply resistance to the sa 5 diene se i ot atabehet locality. Soil 
often important, the influence is ale areous soils Bievany cine 
ident | in several diseases. Nutrition often has a strong influen 
dise Sease and there is a very wide fel for further resntch in this ciection 
It is shown that all three of the e importan fie nt foods obtained 
through the roots—nitrogen, phascbt am and potassium—may, 
eh they are present in excess or are deficient, save a marked eae 
on sisoptiiity to eam ae ony act is not known, ES attention 
throw much light if they could show how specific fertilisers influence the 
chemical composition of the plant cell. 
‘ Bacteriotoxins in soils.—By C. M. HurcHtyson. 
The future of applied entomology.—By F. M. Howxerr. 
Northern cotton.—By G. R. Hison. 
Improvement of cotton in the Punjab.—By D MILNE. 
An ac t of a year’s working of a large Indian estate 
(Pa usa, "Bihar), —By G. S. HENDERSON. 
Some problems arising from the successful alae of 
American cotton in the Western Punja Ww. 
Rosperts, 
Some factors affecting efficiency in the use of canal water. 
y W. Roserts and E. FAULKNER. 
distric 
Soil surveys in the Punjab. eS B. N. Witspon. 
Beginnings i in insect pase and their economic signifi- 
cCance.—By S. K. Smn 
Some es about song of the North-East India tea 
—By G. D. H 
Manures in relation to soils and crop produces. in the 
Central Provinces —By D. CLousTON. 
