79 
or maize, wheat, beans. Wheat must never immediately follow 
beans, since these add too much nitrogen to the so 
An interesting and useful table is given of the most important 
kinds of wheat grown in East Africa, _— the districts in whic 
the varieties are grown and remarks on their characters and 
economic value. A baaliat of plateau abe weighs between 60 
and 65 lbs., and the average yield per acre is 20 bushels. A 
bushel of Nj joro wheat weighs between 55 and 60 Ibs. and the 
average yield is 15 bushels to the acre. Calculations are given 
showing that on 500 acres of wheat a net profit ot from £1,250 
to £3,250 is to be expected. 
ree species of rust fungi attack wheat in Kast Africa, 
namely: Puccinia graminis, generally known as the ‘‘ Black Stem 
Rust, i glumarum, or the ‘‘ Yellow Rust,’’ and P. triticina, or 
th rown’’ or ‘‘ Leaf Rust.’’ Of these, Puccinia graminis 
is the worst and the most destructive, ae all parts of the plants, 
but varie the ems, are attack glumarum is not 
very common, and is most often feel. on wheat of Egyptian 
origin.. P, triticina appears mostly on the leaves. The most 
practical method of combating the rust fungi is the breeding and 
selecting of resistant varieties. Thus by crossing Egyptian 
wheat, which is very susceptible to the attacks of P. glumarum, 
but highly resistant to P. graminis, with the Australian *‘ Nut 
Cut,’ which is almost immune to the attacks of P. oe aes 
but susceptible to P. graminis, a variety was obtained, some o 
whose progeny were highly resistant to both forms of rust. 
Ustilago Tritici, the loose-smut, is very generally distributed in 
East Africa, and Cadospoten herbarum is also respsonsible for 
some damage to ripe 
The most serious ae pest of wheat in East Africa is the 
Wheat Aphis or Green Fly (Yoxopiera graminum). Natural 
even elephants, sometimes raid or cross wheat-fields, but the most 
destructive of all animals to wheat are pigeons and small birds. 
Brazil Wood.—In the paper on this subject (K.B. 1916, 
Pp: ba it was stated that herbarium specimens and a log of 
‘ Braziletto ’’ (Haematoxylon Brasiletto, Karst.), had been pro- 
mised to ihe Director from Colombia, with a view to determining 
oe origin of ‘* Peach Wood,’’ “ Lima Wood,’’ ‘ Nicaragua 
ood ’’ or “ Wood of St. Martha, 2 formerly an important article 
io “i ade about one hundred years ago. ay flowering and fruiting 
specimens, collected by Mr. M. T. Dawe, F.L.S. (Nos. 480 and 
575, Herb. Kew) reached Kew in Masel 1917; but the log, 
although advised in September, 1916, as bettie ready at Santa 
Marta for shipment, did not arrive until November, 1919. The 
delay may best be accounted for in the following letter from the 
British Vice-Consul, Mr. Philip H. nae 1, at = Marta, 
dated October 10th, 1919: “‘ About two years r. M 
Dawe handed over to me for eoneedicn to you by first opportu- 
