1. Em plantas sãs, de laranjeira Bahia enxertada sôbre azêda, a pressão osmótica acima e abaixo da região da enxertia é a mesma. 2. Em plantas doentes, a pressão osmótica abaixo da região da enxertia é muito menor do que acima. Na raiz, a diferença da pressão osmótica entre plantas sãs e doentes é ainda mais acentuada. 3. A pressão osmótica das fôlhas da laranjeira azêda de pé franco é muito superior à das fôlhas da laranjeira caipira. 4. O cavaleiro parece produzir alteração na pressão osmótica do cavalo, algumas vêzes elevando-a e outras abaixando-a.

1. In healthy plants, of Bahia oranges budded on sour orange stock the osmotic pressure above and below the union of stock and scion is the same. 2. In diseased plants, the osmotic pressure below the union is much smaller than above. The difference of this pressure between roots of healthy and diseased plants is still more evident. 3. The osmotic pressure of the leaves of an unbudded sour orange tree is much superior than that of the caipira orange. 4. The scion seems to produce alteration on the osmotic pressure of the stock, sometimes raising and sometimes lowering it.

Cotton seeds subjected to relative humidities varying from 10 to 100% were studied regarding their intensity of respiration. Pettenkoffer tubes were employed, so that one could works simultaneously with 6 of them. H2SO4 solutions controlled the relative humidities. Respiration was found to be noticeable obove 80% relative humidity. Cotton seeds kept under relative humidities varying from O up to 90%, exibit seed-humidities which varied from 1,10 to 20,97%.

Knudson's asymbiotic method and medium for germination of orchid seeds were used with success. Heating this medium at 100°C twice for 15 minutes with an interval of 24 hours was found to be better than to sterilize just once at 120°C. This procedure avoids the hydrolysis of the agar. The poor quality of the glass from which some test tubes were made raised the pH tabove 5.9 and this was apparently the cause of poor developmen of the seedlings. Also some toxic elements given off by the glass diffusing thru the medium might havo impaired somewhat the results obtained in the experiment.