Astanga Hrudaya
पच्यमानात्प्रजायन्ते क्षीरात्सन्तानिका इव। धात्वाशयान्तरक्लेदो विपक्वः स्वंस्वमूष्मणा॥९॥
(metabolic heat activity) of blood just as the layer of scum, during the cooking of milk. Sapta kala - seven membranes: The moisture present inside the dhatu (tissue) and asayas (organs) processessed by their own heat (of each dhatu and asaya) become transformed into structures called kala,
english translation