जनि-कर्तुः प्रकृतिः

That which is the Agent (कर्ता) of the verb jan, is called जनिकर्ता. That which is the prime-cause (प्रकृति) of the agent (or product) of the root jan is put in the ablative case. As शृङ्गाच्छरो जायते, the arrow is produced from horn गोमयाद् वृश्चिको जायते the scorpion is produced from cowdung.,