Glass J-tube made out of thick-walled capillary tubing, with a brass screw & collar at end of longer limb. Used for sampling small quantities of gas in respiration or photosynthesis experiments.

For demonstrating absorption of carbon dioxide by green plants in light, with equi-volumetric release of oxygen. Complete with stand.

Simple, Ganong’s.

For experiments in phototropism. A stout cardboard black-lined box with aperture tube and end cap. Overall size 200 x 160 x 130 mm, side tube 110 x 50 mm dia.

For experiments in phototropism with seedlings. Three-chambered case with channels to accept variety of shutters. One chamber has a window at top and back. Provided with clear, opaque and slot shutters and one orange and one blue filter. With three glass containers for seedlings. Overall size 180...

An aluminium case with glass sides to observe root development at different depths, with aluminium shutters to exclude light so that roots will grow down the inside of glass. Bottom panel has holes for drainage, Overall size 380 x 70 x 270 mm.

To show growth of plants and the effects of environment on the rate of growth. Comprises a lightweight metal pointer counterbalanced by a mass hanger & masses, with a large easily readable scale. Complete with stands, mass hanger and masses.

To measure plant growth rate. The recording arm 600 mm with a bristle tip at one end is mounted on an adjustable pillar enabling alteration of height and pressure of the bristle on a disc of 200 mm dia. The other end of the arm has three eyes to give x3, x4, x5 magnifications. A smoked disc is mo...