SERICULTURE 1 1 47 



the manuring, a large quantity of organic substance is left on the soil, which 

 is incorporated in the latter by ploughing and promotes fertility. 



The combination of soya with maize demands the choice of va- 

 rieties of soya which mature at the same time as maize, principalh^ in those 

 cases where, to reduce expenses, sowing is done simultaneousl^^ In the 

 United States, in the maize zone, between the 38th and the 41st degree of 

 latitude, the Hollybrook variety possesses this quality. 



Three methods of sowing soya are at present in use : i) some farmers 

 provide the maize sower with special boxes for soya, in order to sow them 

 together ; 2) others mix the soya with dry sifted soil, and distribute the 

 seed with the manure spreader of the maize sower ; they usualh^ put down 

 12 lbs. per acre of soya seed and 65 lbs. of soil when the manure spreader 

 is adjusted to 75 lbs. per acre; 3) others sow the soya separately after maize, 

 going over the furrow twice, but this method is more expensive. The quan- 

 tity of 12 lbs. per acre represents approximately 3 or to 4 soj'beans to 

 each row. 



890 - On the Value of Lime in Relation to Silkworm Nutrition. — hat.\no iwarichi., in sericulture 



Bulletin dc r Association scricole du Japan, Year II, Xo. 4, pp. 1-4. Tokio, March i, 1916. 



For his experiments, the writer used silkworms of the Koishimaru 

 race having but one generation a year. He reared them on the ordinary 

 method up to the end of the 4th moult. At the time of the 5th moult he formed 

 4 groups of 500 worms each, which he fed with leaves treated : i) with a 

 solution of calcium bicarbonate ; 2) with a solution of calcium chloride ; 

 3) with a solvition of calcium acetate; the 4th group was fed with untreated 

 leaves (control). All the solutions were of 5 % strength. The solution was 

 spread on the leaves in a very fine spray, to the amount of 4 centilitres 

 per 100 momme (375 gr.) of leaves. When dried the leaves were given to the 

 worms. 



On the whole, the worms fed on leaves treated with lime salts grew much 

 more than those of the control group, as is shown by the following weights 

 (in grams) : 



100 100 100 100 100 



Groups adult live silk chrysa- cast 

 worms cocoons cocoons lids skins 



ist 211.35 gr. 166.53 gr. 23.25 gr. 142.42 gr. 0.8; gr. 



2nd 217.90 167.23 23.89 142.44 0.88 



3rd 217.94 , 169. II 23.47 144.76 0.88 



4th (control) . . . 196.81 157-34 22.18 134-3^ 0.79 



The weight of the dried bodies of 100 mature worms, with the intestine 

 entirely emptied, in the case of the groups fed with lime salts exceeded by 

 4 to S grams that of the dried matter of the control group. The weight of the 

 dried matter of 100 live cocoons exceeded that of the control group by 3 

 to 4 gr., made up as follows : 



Silk cocoons i to 1.5 gr. 



Chrysalids 2 to 2.5 



Cast skins 0.07 



