Groom —On Laticiferous Tubes . 
168 
EXPLANATION OF FIGURES IN PLATE XL 
Illustrating Mr. Groom’s paper on the Functions of Laticiferous Tubes. 
Fig. i. From Euphorbia Helioscopia, showing the course of a tube from a 
vascular bundle, through the spongy parenchyma, and palisade- layer, up to the 
epidermis. 
Fig. 2. From Euphorbia Peplus. Surface view of the upper epidermis, with a 
laticiferous tube beneath it. Leitz, oc. i, obj. 7. 
Fig. 3. Ditto. Lower epidermis. 
Fig. 4. Sapium sp. Surface view of the upper epidermis, showing laticiferous 
tube beneath, also palisade- cells. 
Fig. 5. Ditto. Longitudinal section through the midrib, showing a laticiferous 
tube running below the epidermis. Leitz, oc. 1, obj. 7. 
Fig. 6. Ditto. Section showing blunt ending of a laticiferous tube in the 
palisade-layer. Leitz. oc. 1, obj. 1 3 g -. 
Fig. 7. Jacaratia sp. Trans, section of epidermis and palisade-layer, showing 
a forked tube passing up into the latter. Leitz, oc. 1, obj. T V 
Fig. 8. Pharmacosycea sp. Surface view showing a tube running up to the 
surface of the lower epidermis. A portion of the epidermis, near the end of the 
tube, has been cut away, and both the walls of the epidermal cells and of the 
tube are slightly frayed close to the gap. Leitz, oc. 1, obj. 7. 
Fig. 9. Urostigma sp. Surface view of hypoderma, with a laticiferous tube 
running and ending beneath it. Leitz, oc. 1, obj. 7. 
