558 ME J. B. i.awks, DB. GILBERT, AND DB PTOH OH 



13 inches, and beans 11 inches high. Wheat and barley much branched at the 

 giving fourteen stems from the six seeds; all a deep green colour. Beau d< I ■]• : 

 and growing well, excepting that one 1ms a few black specks on the Iowa Bo 



much growth that the plants are considerably crowded in the shade. 



July 4s. — Much crowded. Graminacese 20 inches, Legunnnosse 15 inches high, I i 

 former growing as well as in the open air. The latter appear to suffer from crowding ; 

 their lower leaves dying. 



July 12. — The Graminacca: growing very healthily; Lcguminosa: apparently nor 



July 22. — The Graniinacerc growing vigorously ; Leguminosic revived, and also grow- 

 ing vigorously at the top. During the last few days they have been protected from the 

 direct sun by a sheet of paper tied round the shade. 



July 29. — Four barleys in head ; wheat not so advanced, but nearly as high ; the 

 beans bad again suffered, but one is recovering. Too much crowded. 



Autjust 10. — About as at last date. 



August 24. — About as at last date; barley slowly ripening. 



The object of the experiment being attained, which was to determine whether the 

 conditions of atmosphere were suited to healthy growth, provided the soil supplied 

 sufficient nutriment, no further records of growth were made. 



II. Plants grown in 1858*. 



As in the experiments of 1857, so in those of 1858, the plants grown may be divided 

 into two Scries, as under : — 



Series 1. With no other combined Nitrogen than that contained in the seed sown. 



Series 2. With a supply of known quantities of combined Nitrogen beyond that con- 

 tained in the seed. 



The notes of growth of the plants grown without any extraneous supply of combined 

 nitrogen are given first, and then those of the plants grown with such supply. As 

 before, in several experiments instituted with Leguminous plants they died before 

 attaining a sufficient amount of growth to render it of any use to analyse the products. 

 The records of their progress, such as it was, are, nevertheless, shortly given. 



No. 1. — Wheat (1858); eight seeds ; prepared soil ; without nitrogenous manure. 



(See Plate XV. fig. 4.) 



April 27. — Seeds set, and the pot placed under a shade over sulphuric acid. 

 Hay 7. — All the plants up ; the pot removed to its shade on the stand. 

 May 20. — Eight plants; all of a healthy green colour; seven 4 inches high, one just 

 above the soil. 



* The figures (Plate XV.) of the plants grown in 1S5S are reduced from drawings taken, in most cases, 



not many days before the plants were taken up. 



