On Dew-drops and Snow-drops

 According to the Brahmanda Purana (22, 49), the elephants of the quarters shower "snowdrops" in winter:

On being directed to make the plants and trees flourish, Parjanya and the Diggajas (Elephants of the quarters) shower snowdrops during Hemanta (early winter), born of cool virility. 

Parjanya appears to be the controlling (neural) entity in charge of the heavier bronchi ("elephants"). The trees and plants referred to surely are the (subordinate) bronchi; or do they refer, in this particular case, to the pulmonary veins and the venules? If it is the former then the snowdrops showered would mean the oxygenated blood supplied by the bronchial arteries. These would nourish the "plants" and the "trees" – indeed the entire bronchial apparatus – and make them flourish. But if it is the latter (i.e. veins and venules), then the snowdrops would mean the flow of oxygen molecules emanating from the bronchial tubes. The moon was mentioned previously to be of "cool virility." The codes "cool" and "hot virility" without doubt are connected with oxygen and carbon dioxide respectively. Therefore, the snowdrops without doubt refer to oxygen, either in molecular form or as it exists in oxygenated blood.

Again, in 50-52a:

With their huge trunks, the elephants of the quarters receive the waters oozing from the Ganga and scatter them in the form of water spray. That is remembered as dew-drops.

It is pretty clear from the quote above that what is referred to as "dew drops" in the Puranic literature are the (deoxygenated) flows contained in the pulmonary arterioles and smaller arteries. The heavier bronchi are viewed as having been entrusted (by the Lord) with the job of drawing in the pulmonary arterial flow and then conducting and distributing it to the various quarters of the lung. The "breaking" (splitting) of the pulmonary arteries into different (smaller) channels is termed as "scattering." The big bronchi scatter as it were the waters of the Ganges which they have drawn up by their trunks. Throughout the entire Puranic literature, the relationship between the pulmonary artery and the bronchial conduit is one that excites much poetical fervour. It is viewed as a relationship of mutual interdependence. Sometimes the tortoise is supported by the great snake and sometimes it is the snake that needs support from the tortoise (as in Sankaradeva's Anadi Patana).