1921.] The Eighth Indian Science Congress. Ixxxix 
Sugar s.—Bo th reducing and non-reducing are present in the mango 
in all i stages in very small amount in the unripe stage but in enormous 
e rip age. T m i 
mall a 
peoriy: pie 1 to 5 per cent. The amount of non-reducing sugars 
increases rapidly and in a ripe mango he varie pred 55 to 65 per cent as 
caleulated on the dry matter of the juic 
The ‘Murda’ disease of Chillie (Capsicum.)—By G. §. 
KULKARNI. 
very serious disease known as ‘ Murda’ occurs on the chillie crop 
in the Bombay Pres as It appears every year and does considerable 
amage to the crop ease begi e aan at a t its 
and much reduced in size. Later on the shoots dry up and the plants 
Sab ae d. 
he — is caused = the same poe nee ste the Tambera 
Pits of potato. The mite is also known to attack Zinnia plants. 
Like all other mite diseases it can be nats contealled by salphur treat- 
ment. The mite belongs to a species of Torsonemedea 
Conditions influencing the distribution of Grain Smut 
a sor ght) of Jowar (Sorghum) in India.—By 
RNI 
The Grain Smut (Sphesttee soren) of jowar (sorghum) although 
very common in the Presidencies of B y, Madras, Central Provinces, 
and Burma is rare in the adc engete ye This rarity, from the 
germination st of the smut spores i oratory, W d 
tor. iments both in 
pot and field confirm this fact, namely that the tem mperatine is the 
controlling factor in the distribation of the grain smut in I 
The Chromosome theory of inheritance in relation to 
economic plant bisetiog: —By ARNELL. 
General sketch of the chromosome theory a aba as propounded 
by Morgan and oth 
Character determiners. of factors are carried in the chromosomes of the 
gern: cells, All the hereditary characters of an organism fall into linkage 
or each chromosome. 
The Dery Lea f a erm cell retain waoapane ons omggpenred after 
rom e 
se ving is and from generation to katy Sa oo gugpani 
enka group that come from the same mae we of a cro 
will a ow co oupling n Fy, whereas if gon come from opposite sides hey 
will _— aap 
A age snvculld of crossing over may take place, ie. interchange 
of se tins romosomes during pairing in n the reduction division, and 
this affects the degree of linkage exhibited. 
n theo ory agrees very well with the facts of ee as at 
present sows and forms a very useful working hypothes 
The bearing of this theory on economic plant breeding. 
n dealing with a large number of picegeicaae linkage groups ene be 
w eka out and factors determining econom c characters assigned t eir 
respective groups. Such factors, though of considerable importance, 
